CN112291046B

CN112291046B - Communication method, communication device and computer readable storage medium

Info

Publication number: CN112291046B
Application number: CN201910670881.0A
Authority: CN
Inventors: 黄海宁; 张兴炜; 黎超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2022-05-13
Anticipated expiration: 2039-07-24
Also published as: CN112291046A

Abstract

A communication method, a communication device and a computer-readable storage medium comprise: acquiring channel state information; determining a feedback mode of the data packet according to the channel state information, wherein the feedback mode is Transmission Block (TB) granularity feedback or Code Block Group (CBG) granularity feedback; and sending the data packet and the feedback mode to the terminal equipment. The embodiment of the invention can determine the feedback mode in the sidelink communication.

Description

Communication method, device and computer readable storage medium

Technical Field

Embodiments of the present invention relate to the field of communications technologies, and in particular, to a communication method, an apparatus, and a computer-readable storage medium.

Background

In a wireless communication system, data is transmitted in Transport Blocks (TBs). The TB is generally large, and is usually divided into a plurality of Code Blocks (CBs), each CB may be individually encoded, and then the plurality of encoded CBs are subjected to rate matching, interleaving, concatenation, and the like and then transmitted as one TB. And after determining whether the TB is successfully received, the receiving end sends feedback information of whether the TB is successfully received to the sending end. In a New Radio (NR) Uu, if feedback information only has one indication information, if all CBs in a TB are successfully received, the feedback information is a positive Acknowledgement (ACK), and if there is a CB in the TB that is not successfully received, the feedback information is a Negative Acknowledgement (NACK), which may be referred to as TB granularity feedback. When the feedback information includes a plurality of pieces of indication information, one TB may be divided into a plurality of Code Block Groups (CBGs), each CBG includes a plurality of CBs, each piece of indication information in the plurality of pieces of indication information is used to indicate whether data corresponding to a corresponding CGB is successfully received, if data corresponding to all CBs in one CBG is successfully received, the indication information corresponding to the CBG is ACK, and if data corresponding to CBs in the CBG is not successfully received, the indication information corresponding to the CBG is NACK, which may be referred to as CBG granularity feedback. The feedback granularity of CBG granularity feedback is smaller than the feedback granularity of TB granularity feedback.

In the NR Uu, in a User Equipment (UE) communicating with a base station, whether feedback based on TB granularity or based on CBG granularity is determined by the base station. In the sidelink communication, because of the communication between the UEs, it is impossible to determine whether to feedback based on the TB granularity or based on the CBG granularity during the communication between the UEs.

Disclosure of Invention

The embodiment of the invention discloses a communication method, a communication device and a computer readable storage medium, which are used for determining a feedback mode in sidelink communication.

The first aspect discloses a communication method, which includes acquiring channel state information, determining a feedback mode of a data packet according to the channel state information, and sending the data packet and the feedback mode to a terminal device. The feedback mode of the data packet can be TB granularity feedback or CBG granularity feedback. The terminal equipment which transmits data in the sidelink communication transmits a data feedback mode to the terminal equipment which receives the data, so the terminal equipment which receives the data can transmit feedback information to the terminal equipment which transmits the data according to the received feedback mode, and the feedback mode between the terminal equipment can be determined in the sidelink communication.

As a possible implementation, the channel state information may be one or more of a Channel Busy Ratio (CBR), resource information used by the packet, and a measurement value of a reference signal.

As a possible implementation manner, when the CBR is less than the first threshold, the feedback manner of the packet is determined to be TB granularity feedback, and when the CBR is greater than or equal to the first threshold and less than the second threshold, the feedback manner of the packet is determined to be CBG granularity feedback. Therefore, the terminal equipment sending data in the sidelink communication can determine the feedback mode of the data packet according to the CBR.

As a possible implementation manner, when the resource corresponding to the resource information used by the data packet is an idle resource, the feedback manner of the data packet is determined to be TB granularity feedback, and when the resource corresponding to the resource information used by the data packet is a preemption resource, the feedback manner of the data packet is determined to be CBG granularity feedback. Therefore, the terminal equipment for sending data in the sidelink communication can determine the feedback mode of the data packet according to the resource information for transmitting the data packet.

As a possible implementation manner, when the measured value of the reference signal is less than the third threshold, the feedback manner of the data packet is determined to be TB granularity feedback, and when the measured value of the reference signal is greater than or equal to the third threshold, the feedback manner of the data packet is determined to be CBG granularity feedback. Therefore, the terminal equipment for sending data in the sidelink communication can determine the feedback mode of the data packet according to the measured value of the reference signal.

A second aspect discloses a communication method, which receives a data packet from a terminal device, determines a feedback mode of the data packet according to the data packet, and sends feedback information of the data packet to the terminal device according to the feedback mode of the data packet. The feedback mode can be TB granularity feedback or CBG granularity feedback. The terminal device receiving data in the sidelink communication may determine a feedback mode of the data packet first, and then transmit feedback information to the terminal device transmitting the data packet according to the feedback mode, so that the feedback mode between the terminal devices may be determined in the sidelink communication.

As a possible implementation manner, the size of the data packet may be determined first, and then the feedback manner of the data packet may be determined according to the size of the data packet. Therefore, the terminal equipment receiving data in the sidelink communication can determine the feedback mode of the data packet according to the size of the data packet.

As a possible implementation manner, the number of subchannels occupied by a physical layer side downlink shared channel (psch) for transmitting a data packet may be determined, then the maximum number of TB-configurable CBGs corresponding to the number of subchannels may be determined, where the maximum number is equal to 1, the feedback manner of the data packet is determined to be TB granularity feedback, and where the maximum number is greater than 1, the feedback manner of the data packet is determined to be CBG granularity feedback. Therefore, the terminal device receiving the data packet in the sidelink communication can determine the feedback mode of the data packet according to the maximum number of the TB configurable CBGs corresponding to the number of the sub-channels occupied by the PSSCH used for transmitting the data packet.

As a possible implementation manner, the number of Resource Blocks (RBs) occupied by the PSSCH for transmitting the data packet may be determined, and when the number of RBs is less than the fourth threshold, the feedback manner of the data packet is determined to be TB granularity feedback, and when the number of RBs is greater than or equal to the fourth threshold, the feedback manner of the data packet is determined to be CBG granularity feedback. Therefore, the terminal device receiving the data packet in the sidelink communication can determine the feedback mode of the data packet according to the number of RBs occupied by the PSSCH used for transmitting the data packet.

As a possible implementation, a Modulation and Coding Scheme (MCS) and the number of Resource Elements (REs) of the PSSCH used for transmitting the data packet may be determined, and then a Transport Block Size (TBS) may be determined according to the MCS and the number of REs, and a feedback manner of the data packet may be determined according to the TBS. As can be seen, a terminal device receiving a packet in sidelink communication can determine the feedback mode of the packet according to the MCS of the pscch used for transmitting the packet and the number of REs.

As a possible implementation manner, when the TBS is less than the fifth threshold, the feedback manner of the data packet is determined to be TB granularity feedback, and when the TBS is greater than or equal to the fifth threshold, the feedback manner of the data packet is determined to be CBG granularity feedback.

As a possible implementation manner, the maximum number of CBGs, which is configurable for one TB and corresponds to the TBS, is determined, and when the maximum number is equal to 1, the feedback manner of the data packet is determined to be TB granularity feedback, and when the maximum number is greater than 1, the feedback manner of the data packet is determined to be CBG granularity feedback.

As a possible implementation manner, a ratio of the number of correctly decoded CBs in the CBs included in the TB for transmitting the data packet to the total number of CBs included in the TB for transmitting the data packet is determined, in the case that the ratio is smaller than a sixth threshold, the feedback manner of the data packet is determined to be TB granularity feedback, and in the case that the ratio is greater than or equal to the sixth threshold, the feedback manner of the data packet is determined to be CBG granularity feedback. Therefore, the terminal equipment receiving the data packet in the sidelink communication can determine the feedback mode of the data packet according to the ratio of the correctly decoded CB. Correspondingly, when the terminal device receiving the data packet determines the feedback mode, the terminal device sending the data packet needs to perform blind detection according to the feedback results of the 2 feedback modes.

A third aspect discloses a communication device comprising means for performing the communication method disclosed in the first aspect or any embodiment of the first aspect, or comprising means for performing the communication method disclosed in the second aspect or any embodiment of the second aspect.

A fourth aspect discloses a communication device comprising a processor, a memory, an input interface for receiving information from a communication device other than the communication device, and an output interface for outputting information to the communication device other than the communication device. When the processor executes the memory-stored computer program, the processor is caused to perform the communication method as disclosed in the first aspect or any of the possible implementations of the first aspect, or the processor is caused to perform the communication method as disclosed in the second aspect or any of the embodiments of the second aspect.

A fifth aspect discloses a computer readable storage medium having stored thereon a computer program which, when run, implements a communication method as disclosed in the first aspect or any embodiment of the first aspect, or implements a communication method as disclosed in the second aspect or any embodiment of the second aspect.

Drawings

FIG. 1 is a schematic view of a V2X according to the present invention;

fig. 2 is a schematic diagram of sensing of LTE V2X according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a network architecture according to an embodiment of the present invention;

fig. 4 is a flow chart illustrating a communication method according to an embodiment of the present invention;

FIG. 5 is a flow chart illustrating another communication method disclosed in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 8 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 9 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention.

Detailed Description

The embodiment of the invention discloses a communication method, a communication device and a computer readable storage medium, which are used for determining a feedback mode in sidelink communication. The following are detailed below.

The embodiment of the present invention is applicable to sidelink communication, and in order to better understand the embodiment of the present invention, an application scenario of the embodiment of the present invention is described below. In the following, a vehicle to an internet of vehicles (V2X) for communication between a vehicle and anything is taken as an example for description, and the embodiment of the present invention may be applied to other sidelink communication besides V2X, in addition to V2X, and is not limited herein. In the embodiment of the invention, as the communication demand increases, the fifth generation communication concept-everything interconnection has gradually come into the field of vision of people. Under the network of Long Term Evolution (LTE) technology proposed by the third Generation Partnership Project (3 GPP), the V2X technology is proposed. Referring to fig. 1, fig. 1 is a schematic diagram of a V2X according to an embodiment of the present invention, and as shown in fig. 1, V2X includes vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-infrastructure (V2I) communication, and vehicle-to-network (V2N) communication. In LTE V2X, there is only broadcast service, and the broadcast service has no limitation on the receiving end, that is, the transmitting end transmits data, and any terminal device can be used as the receiving end to receive the data. In order to ensure the reliability of the broadcast service and perform data repeat transmission, in addition to the broadcast service, a unicast service and a multicast service are introduced into the NR V2X. Unicast traffic is a traffic limited communication between a pair of terminal devices, i.e. one terminal device transmits data and the other terminal device receives data. A multicast service is a communication that is restricted to a group, where one end device in the group sends data and the other end devices in the group receive the data. In order to improve the reliability of data transmission, hybrid automatic repeat request (HARQ) technology is supported for unicast and multicast.

In LTE V2X, there are a PSCCH for transmitting data and a physical downlink control channel (PSCCH) for transmitting control information (SCI). In NR V2X, since the unicast traffic and the multicast traffic use the HARQ technology, a physical downlink feedback channel (PSFCH) is defined to transmit HARQ information.

In NR V2X, two resource allocation patterns are defined. Mode 1: the base station schedules the sidelink transmission resource to be used by the UE, that is, the UE needs to request the base station for the resource under the condition that the UE has a requirement for transmitting data, and the base station allocates the resource for the UE according to the request of the UE. Mode 2: the UE determines the sidelink transmission resource in a sidelink resource pool configured by the base station or the network device or a preconfigured sidelink resource pool, that is, the UE may determine the sidelink transmission resource through a sensing (sending) process, that is, the UE obtains information occupied by other UE resources by decoding SCI of other UE or performing Sidelink (SL) measurement, and determines the sidelink transmission resource based on the resource in the resource pool and the resource occupied by other UE. The SL measurement is based on the RSRP value of the corresponding SL demodulation reference signal (DMRS) when decoding the SCI.

Referring to fig. 2, fig. 2 is a schematic diagram of sensing LTE V2X according to an embodiment of the present invention. As shown in fig. 2, the resource pool is an Intelligent Transportation System (ITS) spectrum. When the UE needs to use resources, the UE may decode the SCI within a sliding sensing window (sliding sensing window), that is, within 1s before the current time, and according to the resource occupation and the resource reservation information provided in the SCIs of other UEs, the resource selection may be performed by avoiding the resources occupied by other UEs as shown in the figure, thereby avoiding resource conflicts between different UEs. Wherein, the sliding sensing window is a sensed used resource, the resources of the UE1, the UE2 and the UE3 outside the window are reserved resources to be used by the UEs, the resources in the resource pool except the windows are selectable resources, and the UE can select the resources from the selectable resources.

The determination method of the PSFCH feedback resource may have 2 types, one may indicate the position of the PSFCH time-frequency resource explicitly through SCI or indicate information related to the determination of the PSFCH resource, and the other already supported method is to determine the position of the PSFCH time-frequency resource according to implicit association methods such as the index of the time slot in which the sub-channel used by the PSCCH/PSCCH is located, that is, infer the position of the PSFCH time-frequency resource according to information such as the position of the PSCCH/PSCCH time-frequency resource. For example, the location of the PSFCH resource is determined according to the frequency domain resource location (subchannel) of the PSSCH and the slot number of the psch.

Under the condition of enabling the HARQ mechanism, there are 3 states for HARQ feedback, namely, correct acknowledgement state ACK, incorrect acknowledgement state NACK, and Discontinuous Transmission (DTX) in a state that the UE that does not feed back ACK or NACK does not perform feedback, and usually, the problem of DTX occurs when the UE loses the control information sent to the UE.

There is a congestion control mechanism in LTE V2X, which is to control the overload of the system. When the system is overloaded too much, for example, too many users transmit data, severe transmission collisions may be caused, resulting in poor system performance. The measurement metrics for congestion control are CBR and channel occupancy ratio (CR). The CBR is a ratio of sub-channels (sub-channels) in which a sidelink-received signal strength indicator (S-RSSI) measurement value exceeds a (pre-) configured critical value within 100ms, and is used for measuring the strength of the environmental interference. And the CR is the ratio of the total number of the sub-channels used and to be used by the UE to the total number of the sub-channels configured by the UE in a measurement period of 1000ms, and is used for measuring the channel occupation situation of the UE in a past period. The UE can avoid exceeding the upper limit value of CR by adjusting the transmission parameters, and unfairness caused by excessive resources used by a certain UE can be avoided. The base station can assist the UE to carry out congestion control, the UE can also carry out the congestion control automatically, and the adjustable transmission parameters comprise transmission power, occupied resources, retransmission occupied resources and modulation and coding modes. Under the condition that the base station assists the UE in congestion control, the UE measures the CBR and reports the CBR to the base station, and the base station adjusts scheduling and/or transmission parameters according to the CBR.

In NR Uu, whether Uu, i.e., uplink or downlink between UE and base station, is based on CBG granularity feedback HARQ or TB granularity feedback HARQ is configured by the base station. The base station may configure CBG granularity-based feedback or TB granularity-based feedback through higher layer signaling. In the case of configuring feedback based on the CBG granularity, the maximum configurable number of CBGs for one TB can be configured. Under the condition that the maximum configurable number of CBGs of a TB is N, the feedback bit number corresponding to the TB fed back based on the granularity of the CBG is N no matter how many CBGs the TB actually contains.

In NR Uu, whether communication between a base station and a UE, CBG-based granularity feedback or TB-based granularity feedback is configured by the base station. While NR SL is communication between UE and UE, in the resource allocation mode of mode 2, the base station does not participate in communication between UE and UE, so that it is impossible to efficiently configure CBG-based granularity feedback or TB-based granularity feedback.

In order to better understand a communication method and apparatus disclosed in the embodiments of the present invention, a network architecture used in the embodiments of the present invention is described below. Referring to fig. 3, fig. 3 is a schematic diagram of a network architecture according to an embodiment of the present invention. As shown in fig. 3, the network architecture may include a plurality of terminal devices (3 are illustrated in fig. 1), one terminal device of the plurality of terminal devices may communicate with only another terminal device, that is, unicast service, and one terminal device of the plurality of terminal devices may also communicate with a plurality of terminal devices at the same time, that is, multicast service. For example, the terminal device 1 may communicate with only the terminal device 2, or may communicate with both the terminal device 2 and the terminal device 3.

A terminal device can be a UE, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved PLMN network, etc.

Referring to fig. 4, fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present invention based on the network architecture shown in fig. 3. The steps of the communication method are described in detail below. It is understood that the functions performed by the terminal device in the present application may also be performed by a chip in the terminal device.

401. The first terminal device acquires channel state information.

The channel state information of the first terminal device can be acquired under the condition that the first terminal device has the first data packet to be transmitted. The channel state information of the first terminal device may be one or more of CBR, resource information used by the first data packet, and a measurement value of a reference signal.

In the case that the channel state information is CBR, the first terminal device may measure a resource congestion condition, which may include CBR and CR. The CBR describes a measurement period, i.e., [ n-a, n-1], of the usage proportion of the internal resources, which is used to determine the resource congestion condition, and adjust its own transmission parameters, such as power, MCS, the number of reserved resources, etc., to adapt to the current resource congestion condition. The CBR may be the CBR of the measured PSCCH, or may be the CBR of the measured PSCCH and PSCCH. Where the CBR is that of the measured PSCCH and PSCCH, the CBR may be the maximum, minimum, average, cumulative sum, weighted average, etc. of the CBR of the PSCCH and PSCCH. CR describes the proportion of usage of the terminal device's own resources within a measurement period, i.e., [ n-b, n + c ]. The CR may be the CR of the measured PSCCH, or may be the CR of the measured PSCCH and PSCCH. In the case where the CR is the CR of the measured PSCCH and PSCCH, the CR may be the maximum value, the minimum value, the average value, the sum of sums, the sum of weights, the average of weights, or the like among the CR of the PSCCH and PSCCH. Each terminal device is configured with an upper CR limit, which can limit excessive resource used by a certain terminal device, thereby avoiding unfairness of resource use among different terminal devices. When the CR measured by the terminal equipment reaches the upper limit, the transmission parameters of the terminal equipment are adjusted to avoid exceeding the upper limit of the CR. Wherein a is an integer greater than 0, b is an integer greater than 0, and c is an integer greater than or equal to 0.

The first terminal device may perform sending. The sending result may include free resources and reserved resources in the resource pool, may also include a measurement value of the reference signal, and may also include a measurement value of the free resources, the reserved resources and the reference signal in the resource pool. The free resources in the resource pool are resources which are not selected by the terminal equipment in the resource pool, and the reserved resources in the resource pool are resources which are selected by the terminal equipment but are not used currently for reservation and subsequent use. The reference signal is a reference signal transmitted along with the psch, and may be a demodulation reference signal (DMRS), a Channel State Information Reference Signal (CSIRS), or the like.

In the case that the channel state information is resource information used by the first data packet, the first terminal device may determine resource information used by the first data packet, that is, resource information used for transmitting the first data packet. The resource information used by the first data packet is information of the resource used by the first data packet, and the resource corresponding to the resource information may be an idle resource in the resource pool, that is, the resource used by the first data packet is a resource selected from the idle resource in the resource pool. The resource corresponding to the resource information may also be a resource to be preempted in the resource pool, that is, the sending result indicates that there is no idle resource, or there is an idle resource, but the idle resource is not enough to transmit the first data packet, and the resource occupied or reserved by other terminal devices may be preempted according to the priority of the first data packet, that is, the priority of the service corresponding to the first data packet.

In the case that the channel state information is a measurement value of the reference signal, the first terminal device may measure the reference signal to obtain the measurement value of the reference signal. The measurement value of the reference signal may be one or more of Reference Signal Received Power (RSRP), signal to noise ratio (SNR), Received Signal Strength Indication (RSSI), Reference Signal Received Quality (RSRQ), Channel Quality Indication (CQI), and signal to interference plus noise ratio (SINR).

402. And the first terminal equipment determines the feedback mode of the first data packet according to the channel state information.

After the first terminal device obtains the channel state information, a feedback mode of the first data packet may be determined according to the channel state information. The feedback mode can be TB granularity feedback or CBG granularity feedback.

When the channel state information is CBR, the first terminal device may determine whether the CBR is smaller than a first threshold, and when the CBR is smaller than the first threshold, it indicates that the current resources are sufficient, and may determine that the feedback mode of the first data packet is TB granularity feedback. Under the condition that the CBR is judged to be greater than or equal to the first threshold and smaller than the second threshold, the current resource congestion is serious but not serious, and the feedback mode of the first data packet can be determined to be CBG granularity feedback, so that the resource congestion condition can be relieved by reducing the size of retransmission data, and the utilization efficiency of resources is improved. And when the CBR is judged to be greater than or equal to the second threshold, the current resource congestion is serious, the communication efficiency is low, the gain brought by the HARQ mechanism is reduced, and the HARQ mechanism can be disabled. Meanwhile, in order to ensure the successful transmission probability of the first data packet, the first terminal device may repeatedly send the first data packet to the second terminal device for multiple times, at this time, the second terminal device does not need to send feedback information to the first terminal device, and the first terminal device does not need to wait for the feedback information from the second terminal device. For example, the first threshold is 0.6, the second threshold is 0.8, the CBR measured by the first terminal device is 0.7, and it may be determined that the feedback manner is CBG granularity feedback.

When the channel state information is resource information used by the first data packet, and when the resource corresponding to the resource information is an idle resource in the resource pool, that is, when the sending result is that the idle resource exists and the idle resource is sufficient for transmitting the first data packet, the idle resource may be used to transmit the first data packet, and the first terminal device may determine that the feedback mode of the first data packet is TB granularity feedback. The first terminal device may determine that the feedback mode of the first data packet is CBG granularity feedback, when the resource corresponding to the resource information is a preemption resource in the resource pool.

The first terminal device may determine whether the measured value of the reference signal is smaller than a third threshold value when the channel state information is the measured value of the reference signal, and may determine that the feedback mode of the first data packet is TB granularity feedback when the measured value of the reference signal is smaller than the third threshold value. When the measured value of the reference signal is determined to be greater than or equal to the third threshold, it may be determined that the feedback manner of the first packet is CBG granularity feedback.

403. And the first terminal equipment sends the first data packet and the feedback mode to the second terminal equipment.

After determining the feedback mode of the first data packet according to the channel state information, the first terminal device may send the first data packet and the feedback mode to the second terminal device. The first terminal device may transmit the first data packet to the second terminal device via the PSSCH. The first terminal device may send a feedback manner of the first data packet to the second terminal device through the PSCCH, and the feedback manner may send the first data packet to the second terminal device by using the SCI. The SCI may include indication information for indicating TB granularity feedback or CBG granularity feedback. The indication information may use 1 bit for indication, for example, when the value of this bit is 1, the feedback mode is CBG granularity feedback, and when the value of this bit is 0, the feedback mode is TB granularity feedback. Under the condition that feedback of CBG granularity is supported in V2X, the SCI may further include a Code Block Group Transmission Indication (CBGTI) field, where the bit indication feedback mode is CBG granularity feedback, the CBGTI field is a valid field, and the length of the CBGTI field is the length of a CBG included in one TB or the configurable maximum number of CBGs for one TB. When the bit indication feedback mode is TB granularity feedback, the CBGTI field is an invalid field. For example, assuming that the field length of the CBGTI is equal to a maximum configurable number of TBs, if the bit has a value of 1, the value of the CBGTI field is 111111, which indicates that the maximum configurable number of TBs is 6, and data corresponding to the 6 CBGs are all sent by the first terminal device to the second terminal device.

Optionally, the resource pool may be divided into two resource pools, where one resource pool is used for transmitting data when the feedback mode is TB granularity feedback, and the other resource pool is used for transmitting data when the feedback mode is CBG granularity feedback, and the SCI may include information of the resource pool corresponding to the resource used for transmitting the first data packet, where the information is information capable of uniquely distinguishing the two resource pools.

Optionally, if a data packet 2 with high reliability and low delay requirement comes from the first terminal device in the process of sending the data packet 1, the transmission of the service with high reliability and low delay requirement may be directly performed, and when the second terminal device receives the SCI corresponding to the data packet 1, the second terminal device may not be able to correctly decode the data packet 1 because part of resources in the data packet 1 are occupied by the data packet 2. Assuming that the data packet 2 is sent by the first terminal device to the second terminal device, a Code Block Group Flushing Indication (CBGFI) field is used in the SCI of the scheduling data packet 2 to indicate which data of the data packet 1 are polluted data (i.e. the data packet 2 is sent by the corresponding resource), and the second terminal device flushes the corresponding polluted data in the cache according to the indication of the CBGFI field in the SCI. And if the data packet 2 is not sent to the second terminal equipment by the first terminal equipment, indicating the polluted data of the previous data scheduling in the CBGFI field in the SCI corresponding to the data packet sent to the second terminal equipment by the next first terminal equipment. For example, the first terminal device sends TB1 to the second terminal device, TB1 includes 4 CBGs, and during data transmission, the first terminal device has TB2 with higher priority to send to the third terminal device, that is, a service with higher reliability and low latency, and then uses resources of CBG3 and CBG4 in TB1 to send. After the second terminal device receives the SCI, since CBGs 3 and 4 do not belong to TB1, belong to TB2, and may not be correctly decoded, it is necessary that the first terminal device uses 0011 in the CBGFI field in the SCI sent next to the second terminal device to indicate that CBGs 3 and 4 are contaminated data. That is, in the case where the packet 1 transmitted from the first terminal device to the second terminal device is contaminated, it is indicated in the CBGFI field in the SCI of the packet 2 after the first terminal device transmits the packet 1 to the second terminal device that the packet 1 is contaminated. The data packet 2 may be a first data packet sent by the first terminal device to the second terminal device after the first terminal device sends the data packet 1 to the second terminal device, and the first data packet may be a retransmission data packet of the data packet 1 or a newly transmitted data packet of another data packet. The data packet 2 may also be a first retransmission data packet of the data packet 1 sent by the first terminal device to the second terminal device after the first terminal device sends the data packet 1 to the second terminal device.

404. And the second terminal equipment sends the feedback information of the first data packet to the first terminal equipment according to the feedback mode.

After the first terminal device sends the first data packet and the feedback mode to the second terminal device, the second terminal device receives the first data packet and the feedback mode from the first terminal device. The second terminal device may demodulate and decode the first data packet, and then perform Cyclic Redundancy Check (CRC) on the demodulated and decoded first data packet, that is, perform CRC check on each CB in the TB corresponding to the demodulated and decoded first data packet.

The second terminal device may determine the feedback mode of the first data packet according to the indication information in the SCI. Under the condition that the feedback mode is TB granularity feedback, if all CBs pass CRC check and the CRC check of the TB also passes, the second terminal device generates 1-bit ACK feedback information, and then sends the generated ACK feedback information to the first terminal device, and after receiving the ACK feedback information, the first terminal device indicates that the transmission of the first data packet corresponding to the TB is successful, and does not need to retransmit the first data packet corresponding to the TB, and ends the transmission of the first data packet corresponding to the TB. If the TB has CB failing CRC check or the TB has CRC check failing, the second terminal device generates 1-bit NACK feedback information, and then sends the generated NACK feedback information to the first terminal device, indicating that the transmission of the first data packet corresponding to the TB fails, and the first terminal device retransmits the first data packet corresponding to the TB after receiving the NACK feedback information.

In the case that the feedback mode is CBG granularity feedback, it may be determined that one TB includes several CBGs and which CBs each CBG includes. If all the CBs included in one CBG pass the CRC check, the CRC check of the CBG is passed, and 1-bit ACK information is generated for the CBG. If one or more CBs in the CBs included in one CBG fail CRC check, the CRC check of the CBG is not passed, and 1-bit NACK information is generated for the CBG. And then combining the HARQ information corresponding to all CBGs in sequence to form feedback information. For example, the value of the field indicating the feedback mode in the SCI is 1, the value of the CBGTI field included in the SCI is 111111, the length of the CBGTI field is equal to the maximum configurable number of CBGs for one TB, and the feedback information generated by the second terminal device is ACK/i, NACK/NACK, i NACK, which indicates that the data transmission corresponding to the first to third CBGs is successful, and the data transmission corresponding to the fourth to sixth CBGs is unsuccessful. After receiving the feedback information, the first terminal device may retransmit only the data in the fourth to sixth CBGs in the first data packet, where a value of the CBGTI field included in the corresponding SCI is 000111, which indicates that only the data in the fourth to sixth CBGs are transmitted.

Alternatively, assuming that HARQ multiplexing of multiple TBs is not supported for feedback together in V2X, there is no confusion between the first terminal device and the second terminal device about the number of TBs and the corresponding HARQ information due to SCI loss. At this time, in the transmission process of a data packet, the length of the CBGTI field in the control information from the first terminal device to the second terminal device is not changed, and may be equal to the number of CBGs included in the TB, or a preconfigured maximum configurable number of CBGs for a TB. The second terminal device feeds back only based on the actually transmitted CBG. That is, if the TB includes 4 CBGs at the initial transmission, the second terminal device feeds back 4 bits, and if only 2 CBGs are retransmitted at the retransmission, the second terminal device feeds back 2 bits.

Referring to fig. 5, based on the network architecture shown in fig. 3, fig. 5 is a flowchart illustrating another communication method according to an embodiment of the disclosure. The steps of the communication method are described in detail below. It is understood that the functions performed by the terminal device in the present application may also be performed by a chip in the terminal device.

501. The first terminal device sends a first data packet to the second terminal device.

The first terminal device may send a first data packet to the second terminal device over the PSSCH, the first data packet being transmitted in TBs.

502. And the second terminal equipment determines the feedback mode of the first data packet according to the first data packet.

After the first terminal device sends the first data packet to the second terminal device, the second terminal device may receive the first data packet from the first terminal device, and then the second terminal device may demodulate and decode the TB corresponding to the first data packet, and then perform CRC check, that is, perform CRC check on each CB and TB in the TB.

The second terminal device may determine the feedback mode of the first data packet according to the first data packet. The feedback mode can be TB granularity feedback or CBG granularity feedback. The feedback mode for determining the first data packet according to the first data packet may be predetermined, and both the first terminal device and the second terminal device know how to determine the feedback mode of the first data packet, so that the first terminal device does not need to indicate to the second terminal device through the SCI any more, and can be directly determined by the second terminal device, thereby saving signaling overhead. However, the first terminal device may indicate which CBGs correspond to data to be transmitted, for example, when the feedback mode is CBG granularity feedback, the CBGTI field may be used to indicate, when a bit value in the CBGTI field is 1, that the CBG corresponds to data is transmitted, and when a bit value in the CBGTI field is 0, that the CBG corresponds to data is not transmitted. In the initial transmission, all values in the CBGTI field may be set to 1, which indicates that all data corresponding to the CBG is transmitted, and in the case of retransmission, only the value of the CBG corresponding to the data to be retransmitted in the CBGTI field needs to be set to 1.

In one embodiment, the size of the first data packet may be determined first, and then the feedback mode of the first data packet may be determined according to the size of the first data packet. The size of the first packet may be measured by the number of subchannels, the number of RBs, or the TBS. In a case that the size of the first data packet is measured by using the number of subchannels, the number of subchannels occupied by the pschs for transmitting the first data packet may be determined first, and there may be a correspondence between the number of subchannels and the maximum number of CBGs configurable for a TB, and in a possible implementation, the correspondence may be as shown in table 1:

number of sub-channels	Maximum number of CBGs configurable for a TB
		1-2	1
3-4	2
		4+	4

Table 1 shows the correspondence between the number of sub-channels and the maximum number of TB-configurable CBGs, and then determines the maximum number of TB-configurable CBGs corresponding to the number of sub-channels according to the correspondence. As can be seen from table 1, the maximum number of CBGs configurable for one TB is 1 in the case where the number of subchannels is 1 and 2, 2 in the case where the number of subchannels is 3 and 4, and 4 in the case where the number of subchannels is greater than 4. As can be seen, when the maximum number of CBGs is determined to be equal to 1, the feedback mode of the first packet is determined to be TB granularity feedback, and when the maximum number of CBGs is determined to be greater than 1, the feedback mode of the first packet is determined to be CBG granularity feedback.

In a case where the size of the first packet is measured by using the number of RBs, the number of RBs occupied by the psch for transmitting the first packet may be determined first, and then it may be determined whether the number of RBs is smaller than a fourth threshold, where a feedback manner of the first packet is TB granularity feedback when the number of RBs is determined to be smaller than the fourth threshold, and a feedback manner of the first packet is CBG granularity feedback when the number of RBs is determined to be greater than or equal to the fourth threshold. The configurable maximum number of CBGs for a TB may be a fixed value, and at this time, after the feedback mode of the first packet is determined to be CBG granularity feedback, the number of CBGs that a TB may include is also determined. The configurable maximum CBG number of a TB may also be different according to the number of RBs, and in this case, after the number of RBs is determined, the number of CBGs included in a TB needs to be determined according to the number of RBs. For example, in the case that the number of RBs is within the interval of 136-272, the maximum number of configurable CBGs for a TB is 2.

When the size of the first data packet is measured by using the TBS, the MCS and the number of REs of the PSSCH for transmitting the first data packet may be determined according to the relevant fields in the SCI, such as MCS, time domain resource allocation (time domain resource allocation), frequency domain resource allocation (frequency resource allocation), and the like, then the TBS is determined according to the MCS and the number of REs, and finally the feedback mode of the first data packet is determined according to the TBS. When the maximum configurable tbg number of a TB is a fixed value, after determining the TBs, it may be determined whether the TBs is smaller than a fifth threshold, and when determining that the TBs is smaller than the fifth threshold, determine that the feedback mode of the first data packet is TB granularity feedback, and when determining that the TBs is greater than or equal to the fifth threshold, determine that the feedback mode of the first data packet is CBG granularity feedback. Assuming that the maximum configurable CBG number of one TB is not a fixed value, the maximum configurable CBG number of one TB corresponding to different TBs intervals may be determined according to a correspondence between the TBs and the maximum configurable CBG number of one TB, the feedback mode of the first data packet is determined as TB granularity feedback when the determined maximum number of CBGs is equal to 1, and the feedback mode of the first data packet is determined as CBG granularity feedback when the determined maximum number of CBGs is greater than 1.

It can be seen that the larger the first data packet is, since the retransmission of the entire TB is performed as long as there is a CRC failure of one CB in the TB when the TB granularity feedback is used, the larger the gain when the CBG granularity feedback is used is, the higher the retransmission efficiency of the CBG granularity feedback is. In addition, the larger the first data packet is, the larger the maximum number of CBGs configurable by one TB is, the finer the feedback granularity is, and the higher the retransmission efficiency is.

In another embodiment, the ratio of the number of correctly decoded CBs in the CBs included in a TB to the total number of CBs included in the TB may be determined. And then judging whether the ratio is smaller than a sixth threshold, and under the condition that the ratio is smaller than the sixth threshold, indicating that the number of correctly decoded CBs is small and the proportion of data needing to be retransmitted is large, so that the feedback mode of the first data packet can be determined to be TB granularity feedback. When the ratio is greater than or equal to the sixth threshold, it indicates that there are more correctly decoded CBs and the proportion of data that needs to be retransmitted is small, and therefore, it can be determined that the feedback mode of the first data packet is CBG granularity feedback. The maximum number of configurable CBGs for a TB may be fixed, or may be different values for different ratios. For example, if the sixth threshold is 0.7, then [0.7,0.8] corresponds to a TB with a CBG number of 2, [0.8,0.9] corresponds to a TB with a CBG number of 4, and [0.9,1] corresponds to a TB with a CBG number of 6.

In yet another embodiment, the second terminal device may measure CBR, which may be CBR on the PSFCH. And then the second terminal device may determine whether the CBR is smaller than a seventh threshold, and when it is determined that the CBR is smaller than the seventh threshold, it indicates that the current resource is sufficient, and may determine that the feedback mode of the first data packet is TB granularity feedback. In the case that the CBR is determined to be greater than or equal to the seventh threshold and less than the eighth threshold, indicating that the current resource congestion is serious but not serious, the feedback mode of the first data packet may be determined to be CBG granularity feedback, so that the resource congestion condition may be alleviated by reducing the size of the retransmission data. When the CBR is determined to be greater than or equal to the eighth threshold, it indicates that the current resource congestion is serious, the communication efficiency is low, the gain caused by the HARQ mechanism is reduced, and the HARQ mechanism may be cancelled.

503. And the second terminal equipment sends the feedback information of the first data packet to the first terminal equipment according to the determined feedback mode.

Step 503 is similar to step 404, and the detailed description may refer to step 404, which is not repeated herein.

Referring to fig. 6, based on the network architecture shown in fig. 3 and the same concept of the communication method in the foregoing embodiment, fig. 6 is a schematic structural diagram of a communication device disclosed in the embodiment of the present invention. The communication device may be a terminal device or a chip in the terminal device. As shown in fig. 6, the communication apparatus may include:

an obtaining unit 601, configured to obtain channel state information;

a determining unit 602, configured to determine a feedback mode of the data packet according to the channel state information, where the feedback mode is TB granularity feedback or CBG granularity feedback;

a sending unit 603, configured to send the data packet and the feedback mode to the terminal device.

In one embodiment, the channel state information is one or more of CBR, resource information used by the data packet, and a measurement value of a reference signal.

In an embodiment, in the case that the channel state information is CBR, the determining unit 601 is specifically configured to:

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the CBR is smaller than a first threshold value;

and determining the feedback mode of the data packet to be CBG granularity feedback when the CBR is greater than or equal to a first threshold and less than a second threshold.

In an embodiment, in a case that the channel state information is resource information used by a data packet, the determining unit 601 is specifically configured to:

determining the feedback mode of the data packet to be TB granularity feedback under the condition that the resource corresponding to the resource information is a free resource in the resource pool;

and under the condition that the resource corresponding to the resource information is the resource seized in the resource pool, determining the feedback mode of the data packet to be CBG granularity feedback.

In an embodiment, in the case that the channel state information is a measurement value of a reference signal, the determining unit 601 is specifically configured to:

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the measurement value of the reference signal is smaller than a third threshold value;

and determining the feedback mode of the data packet to be CBG granularity feedback under the condition that the measured value of the reference signal is greater than or equal to a third threshold value.

More detailed descriptions about the obtaining unit 601, the determining unit 602, and the sending unit 603 may be directly obtained by referring to the description about the first terminal device in the embodiment of the method shown in fig. 4, which is not described herein again.

Referring to fig. 7, based on the network architecture shown in fig. 3 and the same concept of the communication method in the foregoing embodiment, fig. 7 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention. The communication device may be a terminal device or a chip in the terminal device. As shown in fig. 7, the communication apparatus may include:

a receiving unit 701, configured to receive a data packet from a terminal device;

a determining unit 702, configured to determine a feedback manner of the data packet according to the data packet, where the feedback manner is TB granularity feedback or CBG granularity feedback;

a sending unit 703, configured to send the feedback information of the data packet to the terminal device according to the feedback mode.

In an embodiment, the determining unit 702 is specifically configured to:

determining the size of the data packet;

and determining the feedback mode of the data packet according to the size of the data packet.

In one embodiment, the determining unit 702 determining the size of the data packet comprises:

determining the number of sub-channels occupied by PSSCH used for transmitting the data packet;

the determining unit 702 determines the feedback mode of the data packet according to the size of the data packet, including:

determining a maximum number of TB-configurable CBGs corresponding to the number of subchannels;

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the maximum number is equal to 1;

and determining that the feedback mode of the data packet is CBG granularity feedback under the condition that the maximum number is more than 1.

determining the number of RBs occupied by PSSCH used for transmitting the data packet;

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the number of the RBs is smaller than a fourth threshold;

and determining that the feedback mode of the data packet is CBG granularity feedback when the number of the RBs is larger than or equal to a fourth threshold value.

determining MCS and RE number of PSSCH used for transmitting the data packet;

determining TBS according to MCS and RE number;

and determining the feedback mode of the data packet according to the TBS.

In an embodiment, the determining unit 702 determines the feedback mode of the data packet according to the TBS includes:

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the TBS is smaller than a fifth threshold value;

and determining that the feedback mode of the data packet is CBG granularity feedback when the TBS is greater than or equal to a fifth threshold value.

determining the maximum number of TB configurable CBGs corresponding to the TBS;

In an embodiment, the determining unit 702 is specifically configured to:

determining the ratio of the number of correctly decoded CBs in the CBs included in the TB for transmitting the data packet to the total number of CBs included in the TB for transmitting the data packet;

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the ratio is smaller than a sixth threshold;

and determining that the feedback mode of the data packet is CBG granularity feedback when the ratio is larger than or equal to a sixth threshold value.

More detailed descriptions about the receiving unit 701, the determining unit 702, and the sending unit 703 may be directly obtained by referring to the related description of the second terminal device in the method embodiment shown in fig. 5, which is not repeated herein.

Referring to fig. 8, fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present invention based on the network architecture shown in fig. 3. The communication device may be a terminal device or a chip in the terminal device. As shown in fig. 8, the communication device may include a processor 801, a memory 802, an input interface 803, an output interface 804, and a bus 805. The memory 802 may be self-contained and may be coupled to the processor 801 by a bus 805. The memory 802 may also be integrated with the processor 801. Bus 805 is used to among other things enable connections between these components.

In one embodiment, a set of computer programs is stored in the memory 802, and the processor 801 is configured to call the computer programs stored in the memory 802 to perform the following operations:

acquiring channel state information;

determining a feedback mode of the data packet according to the channel state information, wherein the feedback mode is TB granularity feedback or CBG granularity feedback;

and an output interface 804, configured to send the data packet and the feedback mode to the terminal device.

In an embodiment, in the case that the channel state information is CBR, the determining, by the processor 801, a feedback manner of the data packet according to the channel state information includes:

and under the condition that the CBR is greater than or equal to the first threshold and less than the second threshold, determining the feedback mode of the data packet to be CBG granularity feedback.

In one embodiment, in the case that the channel state information is resource information used by the data packet, the determining, by the processor 801, a feedback manner of the data packet according to the channel state information includes:

In one embodiment, in the case that the channel state information is a measurement value of a reference signal, the determining, by the processor 801, a feedback manner of the data packet according to the channel state information includes:

Wherein, step 401 may be executed by the processor 801 and the memory 802 in the communication apparatus, step 402 and step 403 may be executed by the output interface 804 in the communication apparatus, and the step of receiving the feedback information by the first terminal equipment side in step 404 may be executed by the input interface 803 in the communication apparatus.

The obtaining unit 601 and the determining unit 602 may be implemented by a processor 801 and a memory 802 in the communication device, and the sending unit 603 may be implemented by an output interface 804 in the communication device.

In another embodiment, the input interface 803 is used for receiving data packets from a terminal device;

the memory 802 stores a set of computer programs, and the processor 801 is configured to call the computer programs stored in the memory 802 to perform the following operations:

determining a feedback mode of the data packet according to the data packet, wherein the feedback mode is TB granularity feedback or CBG granularity feedback;

and an output interface 804, configured to send feedback information of the data packet to the terminal device according to a feedback manner.

In one embodiment, the determining, by the processor 801, a feedback manner of the data packet according to the data packet includes:

determining the size of the data packet;

In one embodiment, the processor 801 determining the size of the data packet comprises:

the processor 801 determining the feedback mode of the data packet according to the size of the data packet includes:

determining the feedback mode of the data packet to be TB granularity feedback under the condition that the maximum number is equal to 1;

determining the number of Resource Blocks (RB) occupied by PSSCH for transmitting the data packet;

under the condition that the number of RBs is smaller than a fourth threshold value, determining that the feedback mode of the data packet is TB granularity feedback;

and determining that the feedback mode of the data packet is CBG granularity feedback when the number of RBs is greater than or equal to a fourth threshold.

determining MCS and RE number of PSSCH used for transmitting the data packet;

determining TBS according to MCS and RE number;

and determining the feedback mode of the data packet according to the TBS.

In one embodiment, the determining, by the processor 801, the feedback mode of the data packet according to the TBS includes:

Wherein, the step 502 can be executed by the processor 801 and the memory 802 in the communication device, the step of receiving the data packet by the second terminal equipment side in the step 501 can be executed by the input interface 803 in the communication device, and the step 503 can be executed by the output interface 804 in the communication device.

The determining unit 702 may be implemented by the processor 801 and the memory 802 in the communication device, the receiving unit 701 may be implemented by the input interface 803 in the communication device, and the transmitting unit 703 may be implemented by the output interface 804 in the communication device.

Referring to fig. 9 based on the network architecture shown in fig. 3, fig. 9 is a schematic structural diagram of another communication device according to an embodiment of the present invention. As shown in fig. 9, the communication apparatus may include an input interface 901, a logic circuit 902, and an output interface 903. The input interface 901 and the output interface 903 are connected via a logic circuit 902. The input interface 901 is used for receiving information from other communication devices, and the output interface 903 is used for outputting information to other communication devices. The logic circuit 902 is used to perform operations other than the operations of the input interface 901 and the output interface 903, for example, to implement the functions implemented by the processor 801 in the above-described embodiments. The communication device may be a terminal device or a chip in the terminal device. The more detailed description about the input interface 901, the logic circuit 902, and the output interface 903 may be directly obtained by referring to the related description of the first terminal device in the method embodiment shown in fig. 4, or directly obtained by referring to the related description of the second terminal device in the method embodiment shown in fig. 5, which is not repeated herein.

The embodiment of the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program runs, the communication method shown in fig. 4 and fig. 5 is realized.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

Claims

1. A communication method, applied to a first terminal device, includes:

acquiring channel state information;

determining a feedback mode of a data packet according to the channel state information, wherein the feedback mode is Transport Block (TB) granularity feedback or Code Block Group (CBG) granularity feedback, the channel state information is one or more of a Channel Busy Ratio (CBR), resource information used by the data packet and a measurement value of a reference signal, the resource corresponding to the resource information is an idle resource or a preemption resource in a resource pool, and the measurement value of the reference signal is one or more of Reference Signal Received Power (RSRP), signal-to-noise ratio (SNR), Received Signal Strength Indication (RSSI), Reference Signal Received Quality (RSRQ), Channel Quality Indication (CQI) and a signal-to-interference-plus-noise ratio (SINR);

and sending the data packet and the feedback mode to a second terminal device.

2. The method of claim 1, wherein, when the channel state information is CBR, the determining a feedback manner of the packet according to the channel state information comprises:

and determining that the feedback mode of the data packet is CBG granularity feedback when the CBR is greater than or equal to the first threshold and less than a second threshold.

3. The method of claim 1, wherein, when the channel state information is resource information used by the data packet, the determining a feedback manner of the data packet according to the channel state information comprises:

determining the feedback mode of the data packet to be TB granularity feedback under the condition that the resource corresponding to the resource information is an idle resource in the resource pool;

and under the condition that the resource corresponding to the resource information is the resource seized in the resource pool, determining that the feedback mode of the data packet is CBG granularity feedback.

4. The method of claim 1, wherein, in case that the channel state information is a measurement value of a reference signal, the determining a feedback manner of a data packet according to the channel state information comprises:

determining that the feedback mode of the data packet is TB granularity feedback under the condition that the measured value is smaller than a third threshold value;

and determining that the feedback mode of the data packet is CBG granularity feedback when the measured value is greater than or equal to the third threshold value.

5. A communication method, applied to a second terminal device, includes:

receiving a data packet from a first terminal device;

and sending the feedback information of the data packet to the first terminal equipment according to the feedback mode.

6. The method of claim 5, wherein the determining the feedback mode of the data packet according to the data packet comprises:

determining a size of the data packet;

and determining a feedback mode of the data packet according to the size of the data packet.

7. The method of claim 6, wherein the determining the size of the data packet comprises:

determining the number of sub-channels occupied by a physical layer side uplink shared channel PSSCH used for transmitting the data packet;

the determining the feedback mode of the data packet according to the size of the data packet comprises:

8. The method of claim 6, wherein the determining the size of the data packet comprises:

and determining that the feedback mode of the data packet is CBG granularity feedback when the number of the RBs is larger than or equal to the fourth threshold.

9. The method of claim 6, wherein the determining the size of the data packet comprises:

determining a Modulation and Coding Scheme (MCS) and the number of Resource Elements (RE) of a PSSCH used for transmitting the data packet;

determining a transport block size TBS according to the MCS and the number of REs;

and determining a feedback mode of the data packet according to the TBS.

10. The method of claim 9, wherein the determining the feedback type of the data packet according to the TBS comprises:

and determining that the feedback mode of the data packet is CBG granularity feedback when the TBS is greater than or equal to the fifth threshold.

11. The method of claim 9, wherein the determining the feedback type of the data packet according to the TBS comprises:

determining a maximum number of TB-configurable CBGs corresponding to the TBS;

12. The method of claim 5, wherein the determining the feedback mode of the data packet according to the data packet comprises:

and determining that the feedback mode of the data packet is CBG granularity feedback when the ratio is larger than or equal to the sixth threshold.

13. A communication apparatus, applied to a first terminal device, comprising:

an acquisition unit configured to acquire channel state information;

a determining unit, configured to determine a feedback manner of a data packet according to the channel state information, where the feedback manner is TB granularity feedback or CBG granularity feedback, the channel state information is one or more of CBR, resource information used by the data packet, and a measurement value of a reference signal, the resource corresponding to the resource information is an idle resource or a preemption resource in a resource pool, and the measurement value of the reference signal is one or more of reference signal received power RSRP, signal-to-noise ratio SNR, received signal strength indication RSSI, reference signal received quality RSRQ, channel quality indication CQI, and signal-to-interference-plus-noise ratio SINR;

and the sending unit is used for sending the data packet and the feedback mode to second terminal equipment.

14. The apparatus of claim 13, wherein, when the channel state information is CBR, the determining unit is specifically configured to:

15. The apparatus according to claim 13, wherein, in a case that the channel state information is resource information used by the data packet, the determining unit is specifically configured to:

and under the condition that the corresponding resource of the resource is the resource seized in the resource pool, determining that the feedback mode of the data packet is CBG granularity feedback.

16. The apparatus according to claim 13, wherein in case that the channel state information is a measurement value of a reference signal, the determining unit is specifically configured to:

17. A communication apparatus, wherein the apparatus is applied to a second terminal device, and comprises:

a receiving unit configured to receive a data packet from a first terminal device;

a determining unit, configured to determine a feedback mode of the data packet according to the data packet, where the feedback mode is TB granularity feedback or CBG granularity feedback;

and the sending unit is used for sending the feedback information of the data packet to the first terminal equipment according to the feedback mode.

18. The apparatus according to claim 17, wherein the determining unit is specifically configured to:

determining a size of the data packet;

19. The apparatus of claim 18, wherein the determining unit determines the size of the data packet comprises:

the determining unit determines a feedback mode of the data packet according to the size of the data packet, including:

determining a maximum number of TB configurable CBGs corresponding to the number of subchannels;

20. The apparatus of claim 18, wherein the determining unit determines the size of the data packet comprises:

21. The apparatus of claim 18, wherein the determining unit determines the size of the data packet comprises:

determining MCS and RE number of PSSCH used for transmitting the data packet;

determining TBS according to the MCS and the number of the REs;

and determining a feedback mode of the data packet according to the TBS.

22. The apparatus of claim 21, wherein the means for determining the feedback type of the data packet according to the TBS comprises:

23. The apparatus of claim 21, wherein the means for determining the feedback type of the data packet according to the TBS comprises:

determining a maximum number of TB-configurable CBGs corresponding to the TBS;

24. The apparatus according to claim 17, wherein the determining unit is specifically configured to:

25. A communication device comprising a processor, a memory, an input interface for receiving information from a communication device other than the communication device, and an output interface for outputting information to the communication device other than the communication device, the processor invoking a computer program stored in the memory to implement the method of any one of claims 1-12.

26. A computer-readable storage medium, in which a computer program is stored which, when executed, implements the method of any one of claims 1-12.